marginalia

A Claude Code skill: render any Markdown into a browser-based, click-to-comment thread. Comments return to Claude as clean MCP tool_results; replies render as in-page cards that are themselves annotatable (threaded).

Install

As a Claude Code plugin (recommended):

/plugin marketplace add Jin-HoMLee/marginalia
/plugin install marginalia@marginalia
# restart Claude Code

The bundled .mcp.json registers the MCP server automatically. If Python deps are missing, run python3 -m pip install -r requirements.txt.

Manual (skill + MCP at user scope, no plugin):

python3 -m pip install -r requirements.txt
./scripts/register.sh        # registers the MCP server at user scope
# restart Claude Code

Related MCP server: nia-link

Test

python3 -m pytest -v

Architecture

One process, two faces: a FastMCP stdio server (the tools Claude calls) and a localhost HTTP server (serves the page, receives comments). They share one in-process ThreadStore. See docs/superpowers/specs/2026-06-16-marginalia-mcp-skill-design.md for the full design and docs/superpowers/plans/2026-06-16-marginalia-mcp-skill.md for the build plan.